Topic: Heat Transfer
In forced convection, which of the following is true for Stanton number?
- A. It is the ratio of heat transferred to thermal capacity of fluid
- B. It is the ratio of Nusselt number and Reynolds number
- C. It is the ratio of Nusselt number and Prandtl number
- D. Both (a) and (b)
Answer: A. It is the ratio of heat transferred to thermal capacity of fluid
Explanation: The Stanton number ($St$) measures the ratio of heat transferred into a fluid to the thermal capacity of the fluid. It is defined mathematically as $St = \frac{h}{\rho V c_p}$. Alternatively, it can be written as $St = \frac{Nu}{Re \cdot Pr}$. Thus, (a) is the accurate conceptual definition.